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12.
Expression in poker when someone raises you just to push you around and be a tough guy, usually preflop in Holdem, and you turn around, whip out the testosterone hose, and re-raise a ridiculous amount.
Matt: I call.
Ryan: I call.
Marco: I call.
Sam: I call.
Devin: I call.
Dave: Actually, I'm just gonna raise that a little bit.. double the blind.
Devin: Fuck that shit bitch! I'm droppin' the hammer!
by Devin McNasty March 10, 2005
 
1.
The point near the end of a race where you surge with everything you have to pull away for the win.
I thought Ritz would keep it close, but Webb decided to drop the hammer with 500 to go!
by Markkimarkkonnen November 27, 2005
 
2.
To "legislate". To crack down on a certain violation or injustice.
Time to drop the hammer, and dispense some indiscriminate justice!
by Kevin Gaines April 03, 2004
 
3.
Holding nothing back. Usually refers to ending something.

The term comes from the hammer action on a gun. The hammer dropping on many pistols is what causes them to fire. If you "drop the hammer" on somebody, you go all out.
Matt Hughes was doing good until GSP decided to drop the hammer on him.
by SexHammer June 21, 2011
 
4.
To perform an action without restraint...usually as a last resort.
That's it! I've tried to play nice with you, now you've given me no choice! It's time to drop the hammer!
by Kurogane7 November 22, 2010
 
5.
An idiomatic expression meaning roughly "to explode in a fit of rage and fury", it is derived from the action of a firearm hammer "dropping" -- or striking -- the firing pin which in turn impacts the round and causes the mini explosion that results in a bullet or other projectile being launched at a high velocity out of the end of a barrel.

The expression can be used in several different variations with the above definition: 1) ...part. in a draconian way 2) ...leaving a wake of destruction in its path 3) ...against a very specific target with precision; etc.
"I have a clear shot of the target. Requesting permission to engage."
"You have the green light. Drop the hammer on that motherfucker."
BANG. Bad guy fall down.
by SaltoftheEarth March 08, 2014
 
6.
Having sex with a girl, usually a one night stand or to end a long drought of not getting any.
"Hey man, why not? It's been a while and she isn't that ugly. Take her home and drop the hammer on her. It'll be good for you."
by Alex in East Los Angeles June 24, 2012
 
7.
to hit the throttle hard
north jersey guido: they really dropped the hammer last night at that show.
jersey slut: fuckin-a right, and it rocked!
by octo January 26, 2004